PostgreSQL

oid

oid

Row identifier (hidden attribute; must be explicitly selected)

relname

name

Name of the table, index, view, etc.

relnamespace

oid

pg_namespace.oid

The OID of the namespace that contains this relation

reltype

oid

pg_type.oid

The OID of the data type that corresponds to this table’s row type, if any (zero for indexes, which have no pg_type entry)

reloftype

oid

pg_type.oid

For typed tables, the OID of the underlying composite type, zero for all other relations

relowner

oid

pg_authid.oid

Owner of the relation

relam

oid

pg_am.oid

If this is an index, the access method used (B-tree, hash, etc.)

relfilenode

oid

Name of the on-disk file of this relation; zero means this is a “[.quote]#mapped”# relation whose disk file name is determined by low-level state

reltablespace

oid

pg_tablespace.oid

The tablespace in which this relation is stored. If zero, the database’s default tablespace is implied. (Not meaningful if the relation has no on-disk file.)

relpages

int4

Size of the on-disk representation of this table in pages (of size BLCKSZ). This is only an estimate used by the planner. It is updated by VACUUM, ANALYZE, and a few DDL commands such as CREATE INDEX.

reltuples

float4

Number of live rows in the table. This is only an estimate used by the planner. It is updated by VACUUM, ANALYZE, and a few DDL commands such as CREATE INDEX.

relallvisible

int4

Number of pages that are marked all-visible in the table’s visibility map. This is only an estimate used by the planner. It is updated by VACUUM, ANALYZE, and a few DDL commands such as CREATE INDEX.

reltoastrelid

oid

pg_class.oid

OID of the TOAST table associated with this table, 0 if none. The TOAST table stores large attributes “[.quote]#out of line”# in a secondary table.

relhasindex

bool

True if this is a table and it has (or recently had) any indexes

relisshared

bool

True if this table is shared across all databases in the cluster. Only certain system catalogs (such as pg_database) are shared.

relpersistence

char

p = permanent table, u = unlogged table, t = temporary table

relkind

char

r = ordinary table, i = index, S = sequence, t = TOAST table, v = view, m = materialized view, c = composite type, f = foreign table, p = partitioned table, I = partitioned index

relnatts

int2

Number of user columns in the relation (system columns not counted). There must be this many corresponding entries in pg_attribute. See also pg_attribute.attnum.

relchecks

int2

Number of CHECK constraints on the table; see pg_constraint catalog

relhasoids

bool

True if we generate an OID for each row of the relation

relhasrules

bool

True if table has (or once had) rules; see pg_rewrite catalog

relhastriggers

bool

True if table has (or once had) triggers; see pg_trigger catalog

relhassubclass

bool

True if table has (or once had) any inheritance children

relrowsecurity

bool

True if table has row level security enabled; see pg_policy catalog

relforcerowsecurity

bool

True if row level security (when enabled) will also apply to table owner; see pg_policy catalog

relispopulated

bool

True if relation is populated (this is true for all relations other than some materialized views)

relreplident

char

Columns used to form “[.quote]#replica identity”# for rows: d = default (primary key, if any), n = nothing, f = all columns, i = index with indisreplident set (same as nothing if the index used has been dropped)

relispartition

bool

True if table or index is a partition

relrewrite

oid

pg_class.oid

For new relations being written during a DDL operation that requires a table rewrite, this contains the OID of the original relation; otherwise 0. That state is only visible internally; this field should never contain anything other than 0 for a user-visible relation.

relfrozenxid

xid

All transaction IDs before this one have been replaced with a permanent (“[.quote]#frozen”#) transaction ID in this table. This is used to track whether the table needs to be vacuumed in order to prevent transaction ID wraparound or to allow pg_xact to be shrunk. Zero (InvalidTransactionId) if the relation is not a table.

relminmxid

xid

All multixact IDs before this one have been replaced by a transaction ID in this table. This is used to track whether the table needs to be vacuumed in order to prevent multixact ID wraparound or to allow pg_multixact to be shrunk. Zero (InvalidMultiXactId) if the relation is not a table.

relacl

aclitem[]

Access privileges; see GRANT and REVOKE for details

reloptions

text[]

Access-method-specific options, as “[.quote]#keyword=value”# strings

relpartbound

pg_node_tree

If table is a partition (see relispartition), internal representation of the partition bound